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參數(shù)資料
| 型號： | GMS81C7216 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8-BIT SINGLE-CHIP MICROCONTROLLERS |
| 中文描述： | 8位單晶片微控制器 |
| 文件頁數(shù)： | 42/93頁 |
| 文件大小： | 853K |
| 代理商： | GMS81C7216 |
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GMS81C1404/GMS81C1408
40
June. 2001 Ver 1.2
11. CLOCK GENERATOR
The clock generator produces the basic clock pulses which
provide the system clock to be supplied to the CPU and pe-
ripheral hardware.
The main system clock oscillator oscillates
with a crystal resonator or a ceramic resonator
connected to the
Xin and Xout pins. External clocks can be input to the main
system clock oscillator. In this case, input a clock signal to
the Xin pin and open the Xout pin.
Figure 11-1 Block Diagram of Clock Pulse Generator
11.1 Oscillation Circuit
X
IN
and X
OUT
are the input and output, respectively, a in-
verting amplifier which can be set for use as an on-chip os-
cillator, as shown in Figure 11-2 .
Figure 11-2 Oscillator Connections
To drive the device from an external clock source, Xout
should be left unconnected while Xin is driven as shown in
Figure 11-3 . There are no requirements on the duty cycle
of the external clock signal, since the input to the internal
clocking circuitry is through a divide-by-two flip-flop, but
minimum and maximum high and low times specified on
the data sheet must be observed.
Oscillation circuit is designed to be used either with a ce-
ramic resonator or crystal oscillator. Since each crystal and
ceramic resonator have their own characteristics, the user
should consult the crystal manufacturer for appropriate
values of external components.
Figure 11-3 External Clock Connections
Note:
When using a system clock oscillator, carry out wir-
ing in the broken line area in Figure 11-2 to prevent
any effects from wiring capacities.
- Minimize the wiring length.
- Do not allow wiring to intersect with other signal
conductors.
- Do not allow wiring to come near changing high
current.
- Set the potential of the grounding position of the
oscillator capacitor to that of V
SS
. Do not ground to
any ground pattern where high current is present.
- Do not fetch signals from the oscillator.
Internal system clock
PRESCALER
CLOCK PULSE
GENERATOR
÷
1
Peripheral clock
÷
2
÷
4
÷
8
÷
16
÷
128
÷
256
÷
512
÷
1024
÷
32
÷
64
÷
2048
STOP
WAKEUP
fxin
OSCILLATION
CIRCUIT
Xout
Xin
Vss
C1
C2
Recommended: C1, C2 = 30pF
±
10pF for Crystals
R1 = 1M
R1
Xout
Xin
Vss
OPEN
External
Clock
Source
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